422       for (auto & current_elem : as_range(level_elements_begin(level),  in find_neighbors()
425           libmesh_assert(current_elem);  in find_neighbors()
426           Elem * parent = current_elem->parent();  in find_neighbors()
428           const unsigned int my_child_num = parent->which_child_am_i(current_elem);  in find_neighbors()
430           for (auto s : current_elem->side_index_range())  in find_neighbors()
432               if (current_elem->neighbor_ptr(s) == nullptr ||  in find_neighbors()
433                   (current_elem->neighbor_ptr(s) == remote_elem &&  in find_neighbors()
448                        (current_elem->subactive() && neigh->has_children() &&  in find_neighbors()
449                         (neigh->level()+1) == current_elem->level())))  in find_neighbors()
463                       if (current_elem->active())  in find_neighbors()
464                         libmesh_assert_not_equal_to (current_elem->processor_id(),  in find_neighbors()
472                   else if (neigh && (current_elem->subactive() &&  in find_neighbors()
495                                       ncn->is_ancestor_of(current_elem))  in find_neighbors()
507                   current_elem->set_neighbor(s, neigh);  in find_neighbors()
512                     if ((!neigh->active()) && (!current_elem->subactive()))  in find_neighbors()
516                         libMesh::err << "Bad element ID = " << current_elem->id()  in find_neighbors()
518                         libMesh::err << "Bad element proc_ID = " << current_elem->processor_id()  in find_neighbors()
520                         libMesh::err << "Bad element size = " << current_elem->hmin()  in find_neighbors()
522                         libMesh::err << "Bad element center = " << current_elem->centroid()  in find_neighbors()
525                                      << (current_elem->active()?"Active":"Ancestor")  in find_neighbors()
527                                      << current_elem->level() << std::endl;  in find_neighbors()
544           if (current_elem->dim() >= LIBMESH_DIM)  in find_neighbors()
548           current_elem->set_interior_parent(nullptr);  in find_neighbors()
560               current_elem->set_interior_parent(pip);  in find_neighbors()
565           Real node_tolerance = current_elem->hmin() * TOLERANCE;  in find_neighbors()
576                   current_elem->set_interior_parent  in find_neighbors()
582               for (auto & n : current_elem->node_ref_range())  in find_neighbors()
600                   current_elem->set_interior_parent(&child);  in find_neighbors()
607           libmesh_assert(current_elem->interior_parent());  in find_neighbors()